code: def default(self, o: Any) -> dict[str, Any]:
      if isinstance(o, WorkerRunTests):
          result = dataclasses.asdict(o)
          result["__runtests__"] = True
          return result
      else:
          return super().default(o)
  
imports: import contextlib
  import dataclasses
  import json
  import os
  import subprocess
  from typing import Any
  from test import support
  from .utils import StrPath, StrJSON, TestTuple, TestFilter, FilterTuple, FilterDict
label_desc: Use image node_id 1 for calling the _EncodeRunTests obj's underlying member method code with example usage: obj.default(o) and returns: result, super